Maybe, maybe not. You never know what will turn up, it just takes a smart detective to track everything down and connect the dots. Sometimes a connection can be found in the tiniest little detail.
I really do not like that this sheriff is so difficult to make contact with, the article makes it sound like he's holing up in his office and not taking calls at all. Not good, when you consider that the citizens of that county voted him in office and he has an obligation to at least assure them that everything possible is being done to protect them. There could be a serial killer running around abducting and murdering women, for all he knows.
The point is, we can't afford to assume that this is not connected to these other cases because there could be a possibility. We don't know enough details to know one way or the other, but I certainly hope LE knows a lot more than we do at this point.